Buggy code:
public class DataDrivenNumberFormatTestSuite extends TestFmwk { public static abstract class CodeUnderTest { public Character Id ( ) { } public String format ( NumberFormatTestTuple tuple ) { } public String toPattern ( NumberFormatTestTuple tuple ) { } public String parse ( NumberFormatTestTuple tuple ) { } public String select ( NumberFormatTestTuple tuple ) { } } private static enum RunMode { SKIP_KNOWN_FAILURES , INCLUDE_KNOWN_FAILURES ; } private final DataDrivenNumberFormatTestSuite . CodeUnderTest codeUnderTest ; private String fileLine = null ; private int fileLineNumber = 0 ; private String fileTestName = "" ; private NumberFormatTestTuple tuple = new NumberFormatTestTuple ( ) ; static void runSuite ( TestParams params , String fileName , DataDrivenNumberFormatTestSuite . CodeUnderTest codeUnderTest ) { } static void runFormatSuiteIncludingKnownFailures ( TestParams params , String fileName , DataDrivenNumberFormatTestSuite . CodeUnderTest codeUnderTest ) { } private DataDrivenNumberFormatTestSuite ( TestParams params , DataDrivenNumberFormatTestSuite . CodeUnderTest codeUnderTest ) { } private void run ( String fileName , DataDrivenNumberFormatTestSuite . RunMode runMode ) { Character codeUnderTestIdObj = codeUnderTest . Id ( ) ; char codeUnderTestId = ( codeUnderTestIdObj == null ) ? 0 : Character . toUpperCase ( codeUnderTestIdObj . charValue ( ) ) ; BufferedReader in = null ; try { in = TestUtil . getDataReader ( "numberformattestspecification.txt" , "UTF-8" ) ; readLine ( in ) ; if ( ( ( fileLine ) != null ) && ( ( fileLine . charAt ( 0 ) ) == '﻿' ) ) { fileLine = fileLine . substring ( 1 ) ; } int state = 0 ; List < String > columnValues ; List < String > columnNames = null ; while ( true ) { if ( ( ( fileLine ) == null ) || ( ( fileLine . length ( ) ) == 0 ) ) { if ( ! ( readLine ( in ) ) ) { break ; } <START_BUG> if ( ( fileLine . isEmpty ( ) ) && ( state == 2 ) ) { <END_BUG> state = 0 ; } continue ; } if ( fileLine . startsWith ( "////" ) ) { fileLine = null ; continue ; } if ( state == 0 ) { if ( fileLine . startsWith ( "test<seq2seq4repair_space>" ) ) { fileTestName = fileLine ; tuple = new NumberFormatTestTuple ( ) ; } else if ( fileLine . startsWith ( "set<seq2seq4repair_space>" ) ) { if ( ! ( setTupleField ( ) ) ) { return ; } } else if ( fileLine . startsWith ( "begin" ) ) { state = 1 ; } else { showError ( "Unrecognized<seq2seq4repair_space>verb." ) ; return ; } } else if ( state == 1 ) { columnNames = splitBy ( ( ( char ) ( 9 ) ) ) ; state = 2 ; } else { int columnNamesSize = columnNames . size ( ) ; columnValues = splitBy ( columnNamesSize , ( ( char ) ( 9 ) ) ) ; int columnValuesSize = columnValues . size ( ) ; for ( int i = 0 ; i < columnValuesSize ; ++ i ) { if ( ! ( setField ( columnNames . get ( i ) , columnValues . get ( i ) ) ) ) { return ; } } for ( int i = columnValuesSize ; i < columnNamesSize ; ++ i ) { if ( ! ( clearField ( columnNames . get ( i ) ) ) ) { return ; } } if ( ( runMode == ( DataDrivenNumberFormatTestSuite . RunMode . INCLUDE_KNOWN_FAILURES ) ) || ( ! ( breaks ( codeUnderTestId ) ) ) ) { String errorMessage = isPass ( tuple ) ; if ( errorMessage != null ) { showError ( errorMessage ) ; } } } fileLine = null ; } } catch ( Exception e ) { showError ( e . toString ( ) ) ; e . printStackTrace ( ) ; } finally { try { if ( in != null ) { in . close ( ) ; } } catch ( IOException e ) { e . printStackTrace ( ) ; } } } private boolean breaks ( char code ) { } private static boolean isSpace ( char c ) { } private boolean setTupleField ( ) { } private boolean setField ( String name , String value ) { } private boolean clearField ( String name ) { } private void showError ( String message ) { } private List < String > splitBy ( char delimiter ) { } private List < String > splitBy ( int max , char delimiter ) { } private boolean readLine ( BufferedReader in ) throws IOException { } private String isPass ( NumberFormatTestTuple tuple ) { } }

Fix:
if ( ( ( fileLine . length ( ) ) == 0 ) && ( state == 2 ) ) {